1328243771 has 4 divisors (see below), whose sum is σ = 1344246792. Its totient is φ = 1312240752.

The previous prime is 1328243753. The next prime is 1328243783. The reversal of 1328243771 is 1773428231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1773428231 = 43 ⋅41242517.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1328243771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328213771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8001386 + ... + 8001551.

It is an arithmetic number, because the mean of its divisors is an integer number (336061698).

Almost surely, 2^1328243771 is an apocalyptic number.

1328243771 is a deficient number, since it is larger than the sum of its proper divisors (16003021).

1328243771 is an equidigital number, since it uses as much as digits as its factorization.

1328243771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16003020.

The product of its digits is 56448, while the sum is 38.

The square root of 1328243771 is about 36445.0788310301. The cubic root of 1328243771 is about 1099.2401835480.

The spelling of 1328243771 in words is "one billion, three hundred twenty-eight million, two hundred forty-three thousand, seven hundred seventy-one".